Across
- 5. element symbol is Au
- 6. combination of protons and neutrons in the nucleus
- 8. positive charge
- 11. element symbol is Ca
- 12. found in the nucleus
- 15. element symbol is Sb
- 18. has 18 neutrons
- 20. used to identify an element
Down
- 1. neutral charge
- 2. element symbol is H
- 3. has 20 neutrons
- 4. found outside the nucleus
- 7. negative charge
- 9. element symbol is Pb
- 10. atomic mass of 79.904
- 13. abbreviation for the name of an element
- 14. has atomic number of 8
- 16. has 12 electrons
- 17. element symbol is HG
- 19. has 86 electrons